libavcodec/hevc_ps_enc.c

   1 /*
   2  * HEVC Parameter Set encoding
   3  *
   4  * This file is part of Libav.
   5  *
   6  * Libav is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * Libav is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with Libav; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #include "golomb_legacy.h"
  22 #include "hevc_ps.h"
  23 #include "put_bits.h"
  24
  25 static void write_ptl_layer(PutBitContext *pb, PTLCommon *ptl)
  26 {
  27     int i;
  28
  29     put_bits(pb, 2, ptl->profile_space);
  30     put_bits(pb, 1, ptl->tier_flag);
  31     put_bits(pb, 5, ptl->profile_idc);
  32     for (i = 0; i < 32; i++)
  33         put_bits(pb, 1, ptl->profile_compatibility_flag[i]);
  34     put_bits(pb, 1, ptl->progressive_source_flag);
  35     put_bits(pb, 1, ptl->interlaced_source_flag);
  36     put_bits(pb, 1, ptl->non_packed_constraint_flag);
  37     put_bits(pb, 1, ptl->frame_only_constraint_flag);
  38     put_bits32(pb, 0);   // reserved
  39     put_bits(pb, 12, 0); // reserved
  40 }
  41
  42 static void write_ptl(PutBitContext *pb, PTL *ptl, int max_num_sub_layers)
  43 {
  44     int i;
  45
  46     write_ptl_layer(pb, &ptl->general_ptl);
  47     put_bits(pb, 8, ptl->general_ptl.level_idc);
  48
  49     for (i = 0; i < max_num_sub_layers - 1; i++) {
  50         put_bits(pb, 1, ptl->sub_layer_profile_present_flag[i]);
  51         put_bits(pb, 1, ptl->sub_layer_level_present_flag[i]);
  52     }
  53
  54     if (max_num_sub_layers > 1)
  55         for (i = max_num_sub_layers - 1; i < 8; i++)
  56             put_bits(pb, 2, 0); // reserved
  57
  58     for (i = 0; i < max_num_sub_layers - 1; i++) {
  59         if (ptl->sub_layer_profile_present_flag[i])
  60             write_ptl_layer(pb, &ptl->sub_layer_ptl[i]);
  61         if (ptl->sub_layer_level_present_flag[i])
  62             put_bits(pb, 8, ptl->sub_layer_ptl[i].level_idc);
  63     }
  64 }
  65
  66 int ff_hevc_encode_nal_vps(HEVCVPS *vps, unsigned int id,
  67                            uint8_t *buf, int buf_size)
  68 {
  69     PutBitContext pb;
  70     int i;
  71
  72     init_put_bits(&pb, buf, buf_size);
  73     put_bits(&pb,  4, id);
  74     put_bits(&pb,  2, 3);                               // reserved
  75     put_bits(&pb,  6, vps->vps_max_layers - 1);
  76     put_bits(&pb,  3, vps->vps_max_sub_layers - 1);
  77     put_bits(&pb,  1, vps->vps_temporal_id_nesting_flag);
  78     put_bits(&pb, 16, 0xffff);                          // reserved
  79
  80     write_ptl(&pb, &vps->ptl, vps->vps_max_sub_layers);
  81
  82     put_bits(&pb, 1, vps->vps_sub_layer_ordering_info_present_flag);
  83     for (i = vps->vps_sub_layer_ordering_info_present_flag ? 0 : vps->vps_max_layers - 1;
  84          i < vps->vps_max_sub_layers; i++) {
  85         set_ue_golomb(&pb, vps->vps_max_dec_pic_buffering[i] - 1);
  86         set_ue_golomb(&pb, vps->vps_num_reorder_pics[i]);
  87         set_ue_golomb(&pb, vps->vps_max_latency_increase[i] + 1);
  88     }
  89
  90     put_bits(&pb, 6, vps->vps_max_layer_id);
  91     set_ue_golomb(&pb, vps->vps_num_layer_sets - 1);
  92
  93     if (vps->vps_num_layer_sets > 1) {
  94         avpriv_report_missing_feature(NULL, "Writing layer_id_included_flag");
  95         return AVERROR_PATCHWELCOME;
  96     }
  97
  98     put_bits(&pb, 1, vps->vps_timing_info_present_flag);
  99     if (vps->vps_timing_info_present_flag) {
 100         put_bits32(&pb, vps->vps_num_units_in_tick);
 101         put_bits32(&pb, vps->vps_time_scale);
 102         put_bits(&pb, 1, vps->vps_poc_proportional_to_timing_flag);
 103         if (vps->vps_poc_proportional_to_timing_flag)
 104             set_ue_golomb(&pb, vps->vps_num_ticks_poc_diff_one - 1);
 105
 106         if (vps->vps_num_hrd_parameters) {
 107             avpriv_report_missing_feature(NULL, "Writing HRD parameters");
 108             return AVERROR_PATCHWELCOME;
 109         }
 110     }
 111
 112     put_bits(&pb, 1, 0);    // extension flag
 113
 114     put_bits(&pb, 1, 1);    // stop bit
 115     avpriv_align_put_bits(&pb);
 116
 117     return put_bits_count(&pb) / 8;
 118 }